00001 var coreJsData = require('./_coreJsData'); 00002 00004 var maskSrcKey = (function() { 00005 var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || ''); 00006 return uid ? ('Symbol(src)_1.' + uid) : ''; 00007 }()); 00008 00016 function isMasked(func) { 00017 return !!maskSrcKey && (maskSrcKey in func); 00018 } 00019 00020 module.exports = isMasked;